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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29599
Title: The Gaia-ESO Survey: The N/O abundance ratio in the Milky Way
Authors: MAGRINI, LAURA 
Vincenzo, F.
RANDICH, Maria Sofia 
PANCINO, ELENA 
Casali, G.
Tautvaišienė, G.
Drazdauskas, A.
Mikolaitis, Š.
Minkevičiūtė, R.
Stonkutė, E.
Chorniy, Y.
Bagdonas, V.
Kordopatis, G.
Friel, E.
Roccatagliata, V.
Jiménez-Esteban, F. M.
Gilmore, G.
VALLENARI, Antonella 
Bensby, T.
BRAGAGLIA, Angela 
Korn, A. J.
Lanzafame, Alessandro Carmelo 
Smiljanic, R.
Bayo, A.
Casey, A. R.
Costado, M. T.
FRANCIOSINI, Elena 
Hourihane, A.
Jofré, P.
Lewis, J.
Monaco, L.
Morbidelli, L.
SACCO, GIUSEPPE GERMANO 
Worley, C.
Issue Date: 2018
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 618
First Page: A102
Abstract: Context. The abundance ratio N/O is a useful tool to study the interplay of galactic processes, for example star formation efficiency, timescale of infall, and outflow loading factor. <BR /> Aims: We aim to trace log(N/O) versus [Fe/H] in the Milky Way and to compare this ratio with a set of chemical evolution models to understand the role of infall, outflow, and star formation efficiency in the building up of the Galactic disc. <BR /> Methods: We used the abundances from IDR2-3, IDR4, IDR5 data releases of the Gaia-ESO Survey both for Galactic field and open cluster stars. We determined membership and average composition of open clusters and we separated thin and thick disc field stars. We considered the effect of mixing in the abundance of N in giant stars. We computed a grid of chemical evolution models, suited to reproduce the main features of our Galaxy, exploring the effects of the star formation efficiency, infall timescale, and differential outflow. <BR /> Results: With our samples, we map the metallicity range -0.6 ≤ [Fe/H] ≤ 0.3 with a corresponding -1.2 ≤ log(N/O) ≤ -0.2, where the secondary production of N dominates. Thanks to the wide range of Galactocentric distances covered by our samples, we can distinguish the behaviour of log(N/O) in different parts of the Galaxy. <BR /> Conclusions: Our spatially resolved results allow us to distinguish differences in the evolution of N/O with Galactocentric radius. Comparing the data with our models, we can characterise the radial regions of our Galaxy. A shorter infall timescale is needed in the inner regions, while the outer regions need a longer infall timescale, coupled with a higher star formation efficiency. We compare our results with nebular abundances obtained in MaNGA galaxies, finding in our Galaxy a much wider range of log(N/O) than in integrated observations of external galaxies of similar stellar mass, but similar to the ranges found in studies of individual H II regions. <P />Based on observations collected with the FLAMES instrument at VLT/UT2 telescope (Paranal Observatory, ESO, Chile), for the Gaia-ESO Large Public Spectroscopic Survey (188.B-3002, 193.B-0936).Full Table A.1 is only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/618/A102">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/618/A102</A>
URI: http://hdl.handle.net/20.500.12386/29599
URL: https://www.aanda.org/articles/aa/full_html/2018/10/aa33224-18/aa33224-18.html
https://arxiv.org/abs/1807.06297
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201833224
Bibcode ADS: 2018A&A...618A.102M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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